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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments Debt And Equity Securities [Abstract]  
Disclosure - Investment Securities - Summary of Cost, Gross Unrealized Holding Gains and Losses, Allowances for Credit Losses and Fair Value of Available-for-Sale Investments by Types, Maturities and Classes of Securities (Detail) The cost, gross unrealized holding gains, gross unrealized holding

losses, allowances for credit losses and fair value of available-for-sale investments by types, maturities and classes of securities at September 30, 2021 and December 31, 2020 consisted of the following (in thousands):

 

 

 

 

 

As of September 30, 2021

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowance

 

 

Fair

 

 

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

for Credit

 

 

Market

 

 

 

Maturity

 

Cost

 

 

Gains

 

 

Losses

 

 

Losses

 

 

Value

 

Certificates of deposits

 

Within 1 year

 

$

2,853

 

 

$

—

 

 

$

(1

)

 

$

—

 

 

$

2,852

 

U.S. Treasury securities

 

Within 1 year

 

 

10,066

 

 

 

1

 

 

 

—

 

 

 

—

 

 

$

10,067

 

Certificates of deposits

 

1 year to 2 years

 

 

3,137

 

 

 

—

 

 

 

(2

)

 

 

—

 

 

 

3,135

 

U.S. Treasury securities

 

1 year to 2 years

 

 

20,004

 

 

 

—

 

 

 

(2

)

 

 

—

 

 

 

20,002

 

Total

 

 

 

$

36,060

 

 

$

1

 

 

$

(5

)

 

$

—

 

 

$

36,056

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2020

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Estimated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowance

 

 

Fair

 

 

 

 

 

Amortized

 

 

Unrealized

 

 

Unrealized

 

 

for Credit

 

 

Market

 

 

 

Maturity

 

Cost

 

 

Gains

 

 

Losses

 

 

Losses

 

 

Value

 

Certificates of deposits

 

Within 1 year

 

$

1,750

 

 

$

4

 

 

$

—

 

 

$

—

 

 

$

1,754

 

U.S. Treasury securities

 

Within 1 year

 

 

31,806

 

 

 

152

 

 

 

—

 

 

 

—

 

 

 

31,958

 

Total

 

 

 

$

33,556

 

 

$

156

 

 

$

—

 

 

$

—

 

 

$

33,712